How does QoS traffic shaping alleviate network congestion?

How does QoS traffic shaping alleviate network congestion?
A . It drops packets when traffic exceeds a certain bitrate.
B . It buffers and queue packets above the committed rate.
C . It fragments large packets and queues them for delivery.
D . It drops packets randomly from lower priority queues.

Answer: B

Explanation:

Traffic shaping retains excess packets in a queue and then schedules the excess for later transmission over increments of time. The result of traffic shaping is a smoothed packet output rate.

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